Abstract
A numerical study was conducted to investigate the effect of transverse stitching parameters on the stresses in composite single lap joints manufactured using resin transfer moulding (RTM) technique. The lap joints were modelled using plane strain four-node quadrilateral elements, and the stitches were modelled using beam elements. The stitching parameters studied included the modulus of stitch, pitch length, off-edge distance and the stitch angle. It was shown that all the stitching parameters have a significant effect in terms of reducing critical peel stresses except for the pitch length which did not influence the stresses in the critical area. A new stitching concept-angled stitching, was introduced and demonstrated to be effective in reducing all stresses in the stress concentration zone.
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